Cole is reluctant to let go, but when Ben says they're leaving, Cole believes him, he can feel the certainty of that idea, that they are leaving and nothing is going to stop them. So he stands and goes to the crack, sliding himself through easily (why doesn't he just teleport? Because he never teleported down here before, and he's slipping back to that boy more than he knows) and walking to the door to unlock it while Ben gets through.

When it is and Ben has joined him, he reaches his hand out to him again. "They feel what you feel. They'll protect me. Us. Me." The confused pronouns could be a lot of things. "There's a way down through the old prison, then into the tunnels. But Behemoths could fit in the tunnels. Okay?"